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—
Zenith ZTS Series
Low-Voltage Automatic and
Manual Transfer Switches
—
Zenith ZTS Series
Low-Voltage Automatic and Manual Transfer Switches
Since its introduction, Zenith ZTS Series of
transfer switches has become a hallmark of quality
and performance. Reliability resulting from superior
design and heavy duty construction has made the
ZTS the industry standard for critical installations.
Our emphasis on research and development, design
improvements, materials, manufacturing methods,
quality assurance and service yields products that
have been proven in hundreds of thousands of
applications.
Subsequent to the first ZTS units installed, our
engineering staff has been dedicated to the
improvement and expansion of our line.
• ZTS Automatic Transfer Switches 40-4000 Amps
• ZTSD Delayed Transition Transfer Switches 40-4000
Amps
• ZTSCT Closed Transition Transfer Switches 1004000 Amps
• ZBTS Automatic Transition Bypass Switches 1004000 Amps
• ZBTSD Delayed Transition Bypass Switches 1004000 Amps
• ZBTSCT Closed Transition Bypass Switches 1004000 Amps
• Controls tested in accordance with:
- IEEE 472 (ANSI C37.90A)
- EN55022 Class B (CISPR 22) (Exceeds EN55011 &
MILSTD 461 Class 3)
- EN61000-4-2 Class B (Level 4)
- EN61000-4-3 (ENV50140) 10 v/m
- EN61000-4-4
- EN61000-4-5, IEEE C62.41 (1.2 X 50μs, 0.5 to 4 kV)
- EN61000-4-6 (ENV50141)
- EN61000-4-11
- EN55011 :2009+A1 :2010
• Equipment (Controls and Power Section)
Seismic Test Qualified to:
- IBC-2015
- IEEE-693-2005
• Enclosures meet the requirements of:
- UL 508, 50
- ANSI C33.76
- ICS 6
- NEMA 250
• Quality System
- ISO 9001 Registered
All ZTS products meet or exceed industry
requirements allowing specification and installation
confidence.
• UL 1008 listed through 480 VAC
• CSA C22.2 No. 178 listed through 600 VAC
• IEC 947-6-1 listed through 480 VAC
• UL 1008 listed for Short Time rated 1600-3000A
(Non-bypass) ATS for 0.50 sec and 1.0 sec time
duration
• Codes and Standards
- NFPA 70, 99, 101, 110
- IEEE 446, 241, 602
- NEC 517, 700, 701, 702
- NEMA ICS-10
Specification Assistance
ABB offers a complete range of product guide
specifications to help you determine your needs.
For more information, please consult your local ABB
representative, our factory or our website
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Zenith ZTS Series Automatic Transfer Switches
The Zenith ZTS Series is the building block of our
transfer switch product line. This ruggedly built
power contactor family of switches has been
specifically designed for transfer switch duty with
dependability, versatility and user friendliness of
prime concern. ZTS switches are available in open
type construction for switchboard installation or
nema enclosed to the customer’s specifications. The
power panel components, consisting of power
switching contacts, drive mechanism and terminal
lugs, are mounted on a specially formed panel. Logic
devices including microprocessor control auxiliary
time delays and special accessory equipment are
assembled on the door for ease of maintenance
and separation from the power section. They are
connected with a numbered wiring harness equipped
with a disconnect plug that allows isolation of the
control panel for maintenance.
—
ZTS Series Method of Operation
When Source 1 voltage fails or drops to a
predetermined point (usually 80% of nominal),
if required, a circuit is closed to start the engine
generator set. When Source 2 reaches 90% of rated
voltage and 95% of rated frequency, the drive
solenoid is energized through the Source 2
coil control relay, causing the main contacts to
disconnect the load from Source 1 and connect it
to Source 2. After the drive solenoid has completed
its electrical stroke and is seated, the Source 2 coil
control relay opens to disconnect it. The
transfer switch is now mechanically locked in the
Source 2 position. When Source 1 voltage is restored
to a predetermined point (usually 90% of nominal),
the control voltage sensing energizes. The Source 1
side coil relay closes, and after the drive solenoid
has completed its electrical stroke and is seated, the
coil control relay opens to disconnect it. The transfer
switch is now mechanically locked in the Source 1
position.
—
Drive Mechanism
All Zenith ZTS switches employ the simple “overcenter” principle to achieve a mechanically locked
position in either Source 1 or Source 2 and the high
speed drive assures contact transfer in 100ms or
less. High contact pressure and positive mechanical
lock allow for high withstand and closing ratings, far
exceeding UL requirements. All ZTS units are listed
with UL time-based rating, coordinated breaker
and current limiting fuse ratings. Open and Delayed
Transition ATS mechanism does not allow both
sources to be connected at the same time.
—
Neutral Switching
The Zenith ZTS Series is available in true four pole
designs for multi-source power systems that require
neutral switching. The neutral contact is on the same
shaft as the associated main contacts. This ensures
positive operation, and avoids any possibility that
the neutral contact will fail to open or close, as
is possible when the neutral pole is an add-on
accessory. The neutral contacts are identical to the
main contacts, having the same current carrying and
high withstand/closing ratings as the mains. They
are designed to break last and make first to reduce
the possibility of transients while switching the
neutral.
—
Safe Manual Operation
The ZTS manual operator consists of a large,
easy-to-use handle that fits securely for manual
operation during installation and maintenance or
in an emergency. The ZTS may be provided with an
operator inhibit switch to disconnect the electrical
drive prior to maintenance. Fully enclosed wraparound arc covers shield the main contacts and
mechanical components, preventing operator
exposure during manual operation.
—
—
Zenith ZTS Series Automatic Transfer Switches
Transferring Large Motor or Highly Inductive Loads
Some loads, especially large motors, receive severe
mechanical stress if power is transferred out of
phase while the motor is still rotating. Also, back EMF
generated by a motor may result in excess currents
that can blow fuses or trip circuit breakers. ABB
offers four solutions to these problems:
Universal Motor Disconnect (UMD): This
load control disconnects a large motor
via its control circuit for an adjustable
period of time prior to transfer in either
direction. For switching multiple motors,
Accessory UMD disconnects the motors
prior to transfer and brings them back on
line sequentially.
Accessory R50: This is an in-phase
monitor that compares the phase
angle between both sources of power
and prevents transfer until the two
are approximately in phase (within a
selfadjusting range). A high speed transfer
action, coupled with the MX series
microprocessor control logic, ensure
closures at or near zero degree phase
difference.
Series ZTSD: ABB offers delayed
transition switching on transfer switches
rated 40 amperes and above–the Zenith
ZTSD Series. This programmed centeroff position allows for the full decay of
rotating motors or transformer fields.
It can also be used for load shedding of
selected circuits or other applications
which require a means to disconnect the
load from either source. Major UPS system
manufacturers recommend delayed
transition switches for proper restart
sequencing of their systems.
Series ZTSCT: Zenith series of closed
transition switches combine ZTSD
operation during a source failure with a
highly engineered control system that
allows momentary paralleling (100 ms) of
two acceptable sources, thereby limiting
the impact of transfer on the load.
Electrical Ratings
• Ratings 40 to 4000 amperes
• 2, 3 or 4 Poles
• Open type, NEMA 1, 3R, 4, 4X and 12
• Available to 600 VAC, 50 or 60 Hz
• Suitable for emergency and standby applications on
all classes of load, 100% tungsten rated through 400
amps
• UL 1008 listed at 480 VAC
• CSA C22.2 No. 178 certified at 600 VAC
• IEC 947-6-1 listed at 480 VAC
Performance Features
• Contact transfer speed less than 100 milliseconds
• High close-in and withstand capability
• Temperature rise test per UL 1008 conducted
after overload and endurance tests - exceeds UL
requirements
• Available in ZTS (utility-generator), ZTSU
(utilityutility), ZTSG (generator-generator) and ZTSM
(manual) configurations
• Short Time rated 1600-3000A (Nonbypass) ATS for
0.50 sec and 1.0 sec time duration
Design and Construction Features
• Double throw, interlocked operation
• Electrically operated, mechanically held by a simple,
over-center mechanism
• Segmented silver tungsten alloy contacts with
separate arcing contacts on 225 amp and above
• Arc quenching grids, enclosed arc chambers, and
wide contact air gap for superior source-to-source
isolation on all units
• Control circuit disconnect plug and drive inhibit
switch for safe maintenance
• Components accessible for inspection and
maintenance without removal of the switch or power
conductors
• Mechanical indicator and contact chamber cover
designed for inspection, safety and position
designation
• Open Transition ATS perform break before make
operation on all phases
—
MX250 Series Microprocessor Controller
Enhanced Display and Settings
LEDs are used in a recognizable line configuration for continuous monitoring of
switch position. The LCD display shows source availability, exercise time delay
operation and system source condition. A simplified adjustment is featured for
voltage, frequency and time delay settings.
The control operates off a close differential 3-phase under-voltage sensing of
Source 1, factory standard setting 90% pickup, 80% dropout; under-frequency
sensing of Source 1 factory setting 95% pickup; 3-phase voltage and frequency
sensing of Source 2, factory standard setting 90% pickup voltage, 95% pickup
frequency. All factory settings are operator adjustable.
A test function is standard (fast test/load/no load) to simulate Source 1 failure automatically bypassed should Source 2 fail.
More Enhanced Features
• Available in all transfer modes: ~
Open, Delayed & Bypass/Isolation
~ Closed (with newly integrated
transition control)
• User-friendly programmable engine
exerciser, used for the engine
generator with or without load, at any
interval in a one-year period
• Controller can be configured to any
voltages for worldwide application
• Real-time display of ATS status,
including active timer(s)
• Multiple levels of user-defined
password protection
• Serial communications allowing
connectivity with other ATS's,
paralleling switchgear, and SCADA
systems
• Time-tested synchronous logic
automatically measures phase angle
and frequency allowing disturbancefree transfer
• Unsurpassed statistical ATS/System
monitoring available in real-time
• T3/W3 elevator pre-signal.
Automatically bypassed if the
selected source fails, minimizing time
an elevator is without power
• Universal Motor Disconnect (UMD)
sends a pre-signal, post-signal or
both to any motor control center.
Not bypassed in an outage, the UMD
ensures safety in the event of a single
phase loss
• Voltage unbalance detection standard
• Extensive 2/5/10 Warranty
Performance Features
• UL, CSA and IEC listed
• Ringing wave immunity per IEEE 472
(ANSI C37.90A)
• Conducted and Radiated Emissions
per EN55022 Class B (CISPR 11)
(Exceeds EN55011 & MILSTD 461 Class
3)
• ESD Immunity test per EN61000-4-2
Class B (Level 4)
• Radiated RF, electromagnetic field
immunity test per EN61000-4-3
(ENV50140) 10v/m
• Electrical fast transient/burst
immunity test for EN61000-4-4
• Surge immunity test per EN61000-4-5
(IEEE C62.41) (1.2 x 50μs, 0.5 to 4 kV)
• Conducted immunity test per
EN61000-4-6 (ENV50141)
• Voltage dips and interruption
immunity EN55011 :2009+A1 :2010
Technical Benefits
• Separate line voltage components for
controller isolation
• Inputs optoisolated for high electrical
immunity to transients and noise
• Built-in electrical operator protection
• Simplified maintenance – major
components are easily replaceable
• Close differential under-voltage
sensing of the normal source
• Voltage and frequency sensing of the
emergency source (all settings are
adjustable)
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Zenith ZTS Series Accessory Group Matrix
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Zenith ZTS Series Automatic Transfer Switches
6P
Microprocessor activated test switch (Momentary)
6A
Hardwired test switch (Maintained)
6AP
Microprocessor activated test switch (Maintained)
6B
Hardwired test switch (Maintained Auto - Momentary
Test) Key operated
6C
Hardwired test switch (Maintained Auto - Maintained
Test) Key operated
A1
Auxiliary Contact S.P.D.T. - Normal (Source 1) Failure
A1E
Auxiliary Contact S.P.D.T. - Emergency (Source 2)
Failure
A3
Auxiliary Contact - closed in emergency (Source 2)
Additional available (10 max.) on ZTS Series and need
to be specified
A4
Auxiliary Contact - closed in normal (Source 1)
Additional available (10 max.) on ZTS Series and need
to be specified
AB3
Auxiliary Contact - closed in bypass emergency
(Source 2) (S.P.D.T.) (Standard up to 400A) Additional
available (10 max.) on ZBTS Series and need to be
specified
AB4
Auxiliary Contact - closed in bypass normal (Source 1)
(S.P.D.T.) (Standard up to 400A) Additional available
(10 max.) on ZBTS Series and need to be specified
CALIBRATE
Microprocessor activated calibration feature
CDP
Programmable exerciser daily, 7/14/28/365 days userselectable, with or without load
CDT
Exerciser no load timer
CTAP
Chicago transfer alarm panel mounted in door of
enclosure. Includes 3 aux. contacts and fuse.
DS
Disconnect Switch. Disconnects source voltage to
transfer power panel.
DT (DELAYED TRANSITION ONLY)
Time Delay from Neutral Switch position to Source 1
on retransfer
DW (DELAYED TRANSITION ONLY)
Time Delay from Neutral Switch position to Source 2
on retransfer E Engine Start Relay
ECM
Ethernet Communication Adapter. Requires MCM
(Modbus) Accessory.
EL/P
Event log of last 16 events
F
Fan contact, closed when engine runs.
HT(1)(2)
Heater and Thermostat 208/240V (1) 380/600V (2)
mounted and interwired in enclosure. (requires larger
enclosure for 40-200A)
K
Frequency Meter (Analog) - Door mounted
K/P
Frequency Indication on the controller
LNP
Center-off position LCD-Indicator
L1
LED light indicates Switch in Source 2 position
L2
LED light indicates Switch in Source 1 position
L3
LED light indicates Source 1 available
L4
LED light indicates Source 2 available
ZNET901A
Modbus Annunciator
M1
Single Phase Amp Meter (Analog)
M2
Three Phase Amp Meter (Analog)
M90
EPM2200 True RMS Digital Meter with display (Amps,
Volts, Power, Energy, Power Factory and Frequency). 3
Line LED Display. 50/60 Hz Universal Operation. 1 or 3
phase. Standard Modbus RTU RS485 communications
capability. 40 - 1200 Amps.
M90A
Adds Pre-Wiring for Enervista Viewpoint Monitoring
of M90 Accessory & ATS Status using Modbus RS485
Serial Communications
M90B
Adds Pre-Wiring for Enervista Viewpoint Monitoring
of M90 Accessory & ATS Status using Ethernet TCP/IP
Communications
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Zenith ZTS Series Automatic Transfer Switches
M91
EPM6000 True RMS Digital Meter with display (Amps,
Volts, Power, Energy, Power Factory and Frequency,
THD). Certified energy and demand metering. Meets
ANSI C12.20 and IEC 687 Accuracy Classes. Front IrDA
Port Laptop Connection. Standard Modbus RTU RS485
or DNP 3.0 communications capability.
M91A
Adds Pre-Wiring for Enervista Viewpoint Monitoring
of M91 Accessory & ATS Status using Modbus RS485
Serial Communications
M91B
Adds Pre-Wiring for Enervista Viewpoint Monitoring
of M91 Accessory & ATS Status using Ethernet TCP/IP
Communications
MCM
Modbus RTU Communication Module
N1
Running Time Indicator - Door mounted
N2
Operation Counter - Door Mounted
P1
Engine Start Timer (adjustable to 6 sec.)
P2
Engine Start Timer (adjustable to 300 sec.)
Q2
Peak shave/remote load test/area protection - Input
Relay (Need to specify voltage - 120 VAC, 24 VAC, 24
VDC - 120V default standard)
Q3
Inhibit transfer to emergency (Source 2) Load add
Input Relay (Need to specify voltage - 120 VAC, 24 VAC,
24 VDC - 120V default standard)
Q7
Inhibit transfer to normal (Source 1) - Input Relay
(Need to specify voltage - 120 VAC, 24 VAC, 24 VDC 120V default standard)
R1-1/R1-3
Over Voltage sensing for normal (Source 1) single (R11) or three (R1-3) phase
R15/R15D
Load Shed. Should Source 2 become overloaded, an
external signal can be given to ATS to transfer to the
Neutral or dead Normal (Source 1) position.
R16
Phase rotation sensing of Normal (Source 1) and
Emergency (Source 2)
R50
In Phase monitor between Normal (Source 1) and
Emergency (Source 2) to allow transfer
S5P
Microprocessor programmable auto/manual
retransfer selection for transferring to Normal (Source
1) (includes controller softkey for YN accessory)
S12P
Microprocessor programmable auto/manual transfer
selection for transferring to Normal (Source 1) and
Emergency (Source 2) (includes controller softkey for
YN & YE accessory)
S13P
Microprocessor activated commit/no commit on
transferring to Emergency (Source 2) (with enable/
disable settings)
S14
Keyed selector switch for retransfer to normal-testauto
SW1
Auto/Off/Start Engine control selector - Door
mounted (keyed or non-keyed operation available)
SW2
Auto/Off Engine control selector - Door mounted
(keyed or non-keyed operation available)
SW3
Source Priority Selector Switch - Door mounted Allows
selection of Source 1 or Source 2 to be the Prime
Source. Transfer Switch will transfer to selected Prime
Source if that Source is available. (keyed or non-keyed
operation available)
T
Retransfer to Normal (Source 1) adjustable time delay
T3/W3
Pre-signal contact on transfer to Normal (Source 1) or
Emergency (Source 2) during test
U
Engine stop /cool adjustable cool down timer
UMD/A62
Pre and post transfer output adjustable time range.
Functions in both directions. Includes 2 circuits.
(Additional circuits available).
VI
Voltage imbalance between phases (3 Phase only)
W
Adjustable time delay on transfer to Emergency
(Source 2)
YEN/ YER
Bypass transfer timers function (soft key switch in
microprocessor)
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Zenith ZTS Series Dimensional Specifications / Power Connection Terminals
Application Notes:
ZTS Model, Dimensions and Weights
NEMA 1
Ampere
Rating
Poles
40, 80,
100, 150
2, 3
225, 260,
400
2, 3
600
800,
1000,
1200
1600,
2000
3000
4000
4
Height (A) Width (B)
Depth (C)
24 (61)
11 (28)
18 (46)
1.
Weight
Reference
Figure
Open Type NEMA 1
21 (10)
A
57 (26)
60 (27)
70 (32)
165 (75)
75 (34)
170 (68)
166 (75)
380 (172
185 (84)
430 (195)
190 (86)
455 (206)
210 (95)
540 (245)
3
740 (336)
1375 (624)
4
830 (376)
1480 (671)
740 (336)
1375 (624)
830 (376)
1480 (671)
770 (349)
1595 (723)
1025 (465)
1850 (839)
46 (117)
4
24 (61)
14 (36)
2, 3
4
74 (188)
2, 3
40 (102)
19.5 (50)
B
4
90 (229)
3
35.5 (90)
48 (122)
C
4
3
90 (229)
4
46.5 (118)
60 (152)
Application
Notes
1 - 7, 11-14
Metric dimensions (cm) and weights (Kg)
shown in parenthesis adjacent to English
measurements in inches and pounds.
2.
Includes 1.25" door projection beyond base
depth. Allow a minimum of 3" additional
1 - 7, 12-14
depth for projection of handle, light,
switches, pushbuttons, etc.
1 - 8, 12-14
3.
1 - 8, 12-13
All dimensions and weights are approximate
and subject to change without notice.
4.
Special enclosures (NEMA 3R, 4, 12, etc.)
dimensions and layout may differ. Consult
ABB for details.
1-13
5.
Normal and emergency may be ordered
inverted on any switch. The load may be
inverted 600-1200 amps. Consult ABB for
details.
6.
Special lug arrangements may require
different enclosure dimensions. For certified
drawings, contact ABB.
7.
Packing materials must be added to weights
shown. Allow 15% additional weight for
cartons, skids, crates, etc.
8.
Add 4" in height for removable lifting lugs.
9.
Lug adapters for 3000-4000 amp limits may
be staggered length for ease of entrance.
Consult ABB for details.
10.
Louvers must be clear for airflow with
standard cable connections.
11.
A ZTS 40-150A, when ordered with the
following options, will require a larger
enclosure: UMD, Digital Meter, HT, HH, K,
LDS, L11, N1, N2, OCVR-1SG, OCVR-1SS, P2,
SPD, BCI, R26(D). Please contact ABB for
dimensions.
12.
For Delayed and Closed Transition
dimensions and weights, refer to Publication
PB-5067 and PB-5069.
13.
weights, refer to Publication PB-5068.
AL-CU UL Listed Solderless
Screw-Type Terminals for External Power Connections
Normal, Emergency &
Load Terminals
Switch,
Size, Amps
Cables/Pole
Wire Ranges
Switch,
Size, Amps
40-80
1
#8 to 3/0
100, 150
1
225, 260, 400
For Bypass/Isolation dimensions and
14.
Normal, Emergency &
Load Terminals
Cables/Pole
Wire Ranges
600
2
#2 to 600 MCM
#6 to 250 MCM
800, 1000, 1200
4
#2 to 600 MCM
1
#4 to 600 MCM
2
1/O to 250 MCM
1600, 2000,
3000, 4000
*
Notes:
* Line and load terminals are located in rear and arranged for bus bar connection. Terminal lugs are
available as an accessory. Contact ABB for more details.
1.
Special terminal lugs and neutral bars are available at additional cost. Contact factory and advise
cable sizes and number of conductors per pole.
2.
Fully rated neutral provided on 3 phase, 4 wire system.
3.
Special lug arrangements may require different enclosure dimensions. For certified drawings,
contact ABB.
AZTS, when ordered with compression lugs
suitable for use with copper cables, will
require a larger enclosure. For 40-225A, the
enclosure is 46" x 24" x 14" (HxWxD). For
260-400A, the enclosure is 66" x 24" x 19.75"
(HxWxD). For 600A, the enclosure is 74" x
40" x 19.75" (HxWxD). For certifed drawings,
please contact ABB.
—
Zenith ZTS Series Ordering Information
Example
ZTSCT0B00040F-ZEC01ZVC40MSTD
This number string shows the correct format for a ZTS Model Automatic Transfer Switch with closed transition, an Entelli-Switch 250 microprocessor
control unit, Utility - Generator, 400 amps, 4 pole, NEMA Type 1 enclosure, 120/208V 3φ, 4 wire, 60 Hz system with the standard group of accessories.
Z T S C T 0 B 0 0 0 4 0 F - Z E C 0 1 Z V C 4 0 M S T D
1
2
3
4
5
6
7
8
1
Model/Type
7
Operational voltage
ZTS000
Standard (Open Transition)
AB
Consult table below
ZTSD00
Delayed Transition
8
Accessories
ZTSCT0
Closed Transition
MSTD
ZBTS00
Standard (Open Transition) w/Bypass
MEXE
ZBTSD0
Delayed Transition w/Bypass
MCON
ZBTSCT
Closed Transition w/Bypass
MSEN
2
Control panel
MSPE
B0
Entelli-Switch 250, Microprocessor, Control Unit
MPSG
B1
Horizongal bypass unit with MX250
MANO
B4
High withstand panel with MX250 2)
Then choose additional accessories
3
Application
0
Utility - Generator
U
Utility - Utility
M
Manual
G
Gen to Gen
4
Ampere size
004
40 amps
008
80 amps
3
0
240
3
3 wire
60
010
100 amps
3
1
208
3
3 wire
60
015
150 amps
3
2
220
3
3 wire
50
022
225 amps
3
5
139/240
3
4 wire
60
026
260 amps
040
400 amps
060
600 amps
080
800 amps
5
1
440
3
3 wire
60
100
1000 amps
5
2
440
3
3 wire
50
120
1200 amps
5
5
460
1
3 wire
50
160
1600 amps
5
7
480
1
2 wire
60
200
2000 amps
260
2600 amps 1)
300
3000 amps
400
4000 amps
5
Switched poles
B
2 Poles
7
4
266/460
3
4 wire
60
E
3 Poles
7
5
460
3
3 wire
60
F
4 Poles
6
Enclosure type
01
Type 1 Enclosure
12
Type 12 Enclosure
9
3
240/416
3
4 wire
50
3R
Type 3R Enclosure
9
7
380
3
3 wire
60
40
Type 4 Enclosure
4X
Type 4X Enclosure
Note: Operating voltage must be specified at
time of order. Only the most common voltages
are shown above.
00
Open Style Unit
Available only on Bypass configuration
Available for 1600-3000A Non-bypass product ONLY.
1)
2)
A
B
Voltage
Phase Config.
Hz
1
0
120
1
60
2 wire
2
0
120/240
1
3 wire
60
2
2
110/220
1
3 wire
50
4
0
120/208
3
4 wire
60
4
1
127/220
3
4 wire
60
4
2
127/220
3
4 wire
50
5
0
480
3
3 wire
60
5
8
254/440
3
4 wire
60
6
0
575
3
3 wire
60
6
1
347/600
3
4 wire
60
6
3
575
1
2 wire
60
7
0
277/480
3
4 wire
60
7
1
277
1
2 wire
60
8
2
380
1
2 wire
50
9
0
240/416
3
4 wire
60
9
1
220/380
3
4 wire
60
9
2
220/380
3
4 wire
50
—
Zenith ZTS Series Ordering Information
—
Switch Types
• Standard: Unless otherwise noted, the standard
switch with quick transfer will be supplied.
• Delayed Transition: When ordered as the ZTSD, the
delayed transition switch offers time delay during
transfer from one position to the other. This is
primarily for transfer of large motor or inductive
loads.
• Closed Transition: When ordered as the ZTSCT, the
closed transition switch offers two basic modes of
operation. During a failure of one source or an out of
specification condition, the ZTSCT Model operates
as a standard delayed transition switch (ZTSD
Model). This sequence allows clear separation of an
unreliable source from an available one.
• Bypass: When ordered as the ZBTS, the bypass
transition switch offers a draw-out mechanism,
with electrical and mechanical interlocks for secure
removal after load bypass. In this way the transfer
switch and/or the control panel may be tested,
isolated and removed for maintenance without load
interruption.
UL 1008 Withstand and Closing Ratings
Please refer to Publication TB-1102.
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Specifications subject to change without notice.
PB-5066, 19-09
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